A new model of marine sediment compression

作者：Martin Kylara^*; Wood Warren

来源：Earth and Planetary Science Letters, 2017, 477: 21-26.

DOI：10.1016/j.epsl.2017.08.008

• compaction
• dewatering
• consolidation
• seismic inversion
• sediment properties

Marine sediments cover two-thirds of the earth, and porosity (or void ratio) is a major controlling parameter in virtually every model of seafloor properties, including strength, sound speed, hydrology, thermal conductivity, and electrical resistivity. Our new model of void ratio (e) is based on the proportional void ratio, [e(p) = (e - e(r))/(e(0) e(r))], where eo is the depositional maximum at the sea floor, and er is the minimum residual void ratio at depth. We assume the values of eo and er are inherent characteristics of the sediment type. Our model further defines the compression index Cc to be the square root of the proportional void ratio (C-c(e) (e(p))(1/2)). This new formulation establishes a direct relation between void ratio and effective stress: e = (e(0) - e(r))(-1) [log(10)(sigma(0)/sigma) 2(e(0) - e(r))(2)/4 + e(r) and exhibits several advantages over previous models that we demonstrate with compression test data from the Gulf of Mexico and Nankai Trough.

• 出版日期2017-11-1